diff --git a/dandischema/metadata.py b/dandischema/metadata.py
index 2f47334a..9a8e7e2e 100644
--- a/dandischema/metadata.py
+++ b/dandischema/metadata.py
@@ -356,7 +356,7 @@ def migrate(
     if instance_ver == target_ver:
         return obj
 
-    if version2tuple(schema_version) < version2tuple("0.6.0"):
+    if instance_ver < version2tuple("0.6.0") <= target_ver:
         for val in obj.get("about", []):
             if "schemaKey" not in val:
                 if "identifier" in val and "UBERON" in val["identifier"]: